I had the same issue when I once tried using anisotropic filtering via the Nvidia control panel instead of having it enabled in-game. It didn’t yield any better results, performance got even slightly worse, so I reverted the setting in the control panel and enabled anisotropic filtering again in-game. Then I noticed the low quality ground textures surrounding the plane. I knew it had to be related to the changes I made in the control panel. Although I reverted the setting back to original, it appears that something else was also changed in the background that I could not manually revert. I then used the restore button for the MSFS game profile in the control panel and that solved the issue. Although I didn’t see any changes from what I already did manually, it definitely restored some hidden setting which fixed the low quality textures. Please remember to take note of any other settings that you want to keep for this profile. These settings will also be restored to their default values so you’ll have to make them again if you want to keep using them. As a side note, it’s interesting to use Nvidia profile inspector. It will show you many more settings than can be seen in the control panel. You’ll then notice that changing a single setting in the control panel, potentially changes multiple settings in the profile inspector which do not all revert to their original values, even when the setting in the control panel is reverted.
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